/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * <http://www.mongodb.com/licensing/server-side-public-license>.
 */
package org.graylog.storage.opensearch3.views.searchtypes.pivot.series;

import org.graylog.plugins.views.search.searchtypes.pivot.series.Average;
import org.graylog.shaded.opensearch2.org.opensearch.search.aggregations.AggregationBuilders;
import org.graylog.shaded.opensearch2.org.opensearch.search.aggregations.metrics.Avg;
import org.graylog.shaded.opensearch2.org.opensearch.search.aggregations.metrics.AvgAggregationBuilder;
import org.graylog.storage.opensearch3.views.searchtypes.pivot.SeriesAggregationBuilder;

public class OSAverageHandler extends OSBasicSeriesSpecHandler<Average, Avg> {

    protected SeriesAggregationBuilder createAggregationBuilder(final String name, final Average avgSpec) {
        final AvgAggregationBuilder avg = AggregationBuilders.avg(name).field(avgSpec.field());
        return SeriesAggregationBuilder.metric(avg);
    }

    @Override
    protected Object getValueFromAggregationResult(final Avg avg, final Average avgSpec) {
        double value = avg.getValue();
        if (avgSpec.wholeNumber()) {
            if (Double.isNaN(value) || Double.isInfinite(value)) {
                value = 0;
            } else {
                value = Math.round(value);
            }
        }
        return value;
    }
}
